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esp32:esp32_main [2020/10/13 19:54]
admin [Espressif ESP32 Development Board] 		esp32:esp32_main [2020/10/13 20:04]
admin [Espressif ESP32 Development Board]
Line 35: Line 35:
 === Special Hardware Configuration ==== === Special Hardware Configuration ====
  
-** The I/O pins are not 5V-tolerant! ** Use 3.3V instead.\\+** The I/O pins are not 5V-tolerant! **\\ 
 +Use 3.3V instead.\\ 
 +\\
 The build in LED is on GPIO 2.\\ The build in LED is on GPIO 2.\\
-GPIO 34 - 39 are input only. And don't have a software pull-up or pull-down functions. One has to use an external 10k pull-up resistor. Details are at  +\\ 
-[[https://learn.sparkfun.com/tutorials/esp32-thing-hookup-guide/hardware-overview|learn.sparkfun.com]].\\+GPIO 34, 35, 36, 37, 38 and 39 are input only. And don't have a software pull-up or pull-down functions. One has to use an external 10k pull-up resistor.\\ 
 +\\ 
 +GPIO 6, 7, 8, 9, 10 and 11 are used for the SPI flash chip and can't be used  for any other purposes.\\
  
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